// 导出页面为PDF格式
import html2Canvas from 'html2canvas'
import JsPDF from 'jspdf'

export default {
    install(Vue, options) {
        Vue.prototype.getPdf = function () {
            const title = '排水管网管理平台'
            html2Canvas(document.querySelector('#map'), {
                allowTaint: true,
                useCORS: true
            }).then(canvas => {
                const contentWidth = canvas.width
                const contentHeight = canvas.height
                const pageHeight = contentWidth / 592.28 * 841.89
                let leftHeight = contentHeight
                let position = 0
                const imgWidth = 595.28
                const imgHeight = 592.28 / contentWidth * contentHeight
                const pageData = canvas.toDataURL('image/jpeg', 1.0)
                console.log('pageData', pageData)
                const PDF = new JsPDF('', 'pt', 'a4')
                if (leftHeight < pageHeight) {
                    PDF.addImage(pageData, 'JPEG', 0, 0, imgWidth, imgHeight)
                } else {
                    while (leftHeight > 0) {
                        PDF.addImage(pageData, 'JPEG', 0, position, imgWidth, imgHeight)
                        leftHeight -= pageHeight
                        position -= 841.89
                        if (leftHeight > 0) {
                            PDF.addPage()
                        }
                    }
                }
                PDF.save(`${title}.pdf`)
            })
        }
    }
}
